Reinforced-concrete beam.



` G. A. P. TURNER.

REINFORGED CONCRETE BEAM.

APPLIOATION FILED JUNE 5, 1907.

CLAUDE A. I. TURNER, OF MINNEAPOLI'MINNESOTA.

REINFoRcEDicoNcRETE BEAM.

No. '99.73194.v

Specification of Letters Patent.

v Application filed .Tune 5, 1907.

Patented July 6. 190e.

serial No. 377,345.

To (di whom 'it 'may concern:

Be it known that I, CLAUDE A. P. TURNER,

',of Minneapolis,county of Hennepin, State of Minnesota, have inventednew and useful Improvements in Reinforced- Concrete Beams, and ldohereby declare that the following is a full, clear, and exactdescription thereof, reference being had tol the accompanying drawing,in which-fi Figure lis a vertical longitudinal sect1-on of a reinforcedconcrete beam embodying my invention and portions Y ing the same; Fig. 2a horizontal section on the line 2-2 of Fig. l Figs. 3, 4 and 5 are,respectively, cross sections on thev lines 3 3, 4h41 and 5-5 of Fig. 1;

views of portions of the reinforcing rods.

The object of my invention is to so reinforce concrete beams as toprovide for taking care of all the strains or stresses to which the sameare subjected, by an arrangement of rods which will reduce lthe cost ofconstruction without any sacrifice of strength, and to this end- Myinvention consists in the reinforced concrete beam constructedsubstantially as hereinafter specified and claimed'.

In concrete beam construction, there must be taken into account thebending moments,- the shearing stresses, and the tensile strains, inproviding the beam With'adequate reinforcing means, and in making myinvention I have'had in view such reinforcement as will take care ofthese stresses.

The beam, A, .shown inthe drawing is of ordinary construction, beingformedin molds in the usual 4 manner, and extends over columns orsupports B. Extending longitudinally through the beam near its bottom isa eries of straight, horizontal steel rods C to ta e the tensilestrains, and in addition to this series of rods, there are two otherseries of steel rods D and E, respectively, which, speaking generally,also. extend longitudi-- nally through the beam, not only between thead'acent4 columns B, but to a point beyond t e same, and the rods ofeach of these tWo series D and E incline from a point near the bottom ofthe beam and a point in about the same plane as the plane of the rods C,upward, to a point at or near the top of the beamv and above thebeam-supporting column, from which point the rods incline downward intothe portion of the beam on the opposite side lof said support, and thero ls' tcr1ninate in hooks to firmly anchor of columns support vand Fig.`6 detail them in the concrete. l It will be observed that there is adouble inclination of the rods through thebeam on opposite sides of thesupporting column, and that the rods are continuous or uninterrupted atthis point, and as 4the maximum strains `occur at this point, and the,`greatest resisting moments areneeded at this point, it will be seen thatthe structure is amply able to withstand the tensile strains andthebending moments of the beam, and that by reason of the downwardinclination of the rodsfrom the supporting columns, the rods provideagainst the shearing stresses, (which are greatest adjacent thecolumns), since the vertical component of the tension in shear iscarried directly by the lrods because of their inclination.

The angles of inclination of the two sets or series of rods D and E isnot the same. In the case of the rods D their direction down- Ward istoward vthe point of contra-flexure of the beam, where, for `a uniformload, the momentv is zero, and from such point the rodextendshorizontally to the point of contraiiexure near the next suporting column. In the' case of the rods E o the other series they areinclined from a point above the supporting column to a point at or nearthe longitudinal center of the beam,so that the through the beams,`forming obtuse angles 'Whose apexes are successivelyr at or near thebottom ofthe beam at a point midway be- .tween the supporting column andabove the columns, an this arrangement of the rods is'to provide forcases Where the load upon the bea'm isnot uniform; It will be observedthat in the cases ofboth sets of the rods with inclined portions, and.especially in view of the fact that such rods are carried across andbeyond the supporting columns, Vthey tensile. strains produced by loadsupon the beam willk be sustained 'by the inclined portions of the rods.The horizontal portions of the rods D, of course, assist in sustainingthe tensile strains to which the beam is subjected. It will be noted,too, that the rods lap by each other through the beam labove thesupports, so that there is a doubling of the section of the bars at thispoint, which, of course, adds greatly to the strength ofthe structure,and adds4` this strength at a point Where it is needed, because of thestrains upon it thereat..

An important advantage from my arrange -removed at an early ment oftherods is that the centering may be eriod in the work of construction,with per ect safety.

Having thus described my invention, what l claim is:

l. The combination of columns, concrete beams extending from column tocolumn, rods extending through the beams above and to opposite sides ofthe columns, the rods from one side lapping ast those from the otherside, and said ro s being bent to in oline downward into the beams inopposite directions, the aiex of the ybend being at a oint substantiallymidway of the column rom side to side thereof.

2. The combination of columns, concrete beams extending from column tocolumn, rods extending through the beams above and to opposite sidesofthe columns, the rods from one side lapping ast those from the otherside, and said ro s being bent to incline downward into the beam inopposite directions, the a eX of the bend being ata oint substantia lymidway of the column 25 rom side to side thereof, different rods beinginclined at different angles and their lowest points being situated atdifferent distances in the beam from column to column.

3. The combination of columns, concrete' beams extending from column tocolumn, rods extending through the beams aboveand to opposite sides ofthe columns, the rods from one side lapping ast those from the otherside, and said ro s being bent to ineline downward into the beams inopposite directions, thea eX of the bendbeing at a point substantia lymidway of the column from side to side thereof, different rods beinginclined at different angles and their lowest points being situated atdiderent disf tances in the beam from'column to column, and rods runninghorizontally through the beam near the bottom thereof. y

In testimony that l claim the foregoing l have hereunto set my hand.

CLAUDE A. P. TURNER.

Witnesses:

A. M. BRYAN, C. E. GniMns.

